[PATCH] Improved handling of the naked attribute for MSVC compatibility

[Aaron Ballman]

MSVC handles the naked attribute differently than clang does.
Specifically, in MSVC the __declspec(naked) must attach to a function
*definition*, and failure to do so will result in an error.

This patch brings clang's behavior more in line with MSVC's for
__declspec(naked) in MS compatibility mode.  This does not modify the
behavior of the codegen for naked functions (as is being discussed
elsewhere).

~Aaron
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